Chaïm Alster (* 1936) was born in Berlin. His parents had previously fled from Poland and Ukraine with their families because Jews were being persecuted there. But the Alster family was not safe in Nazi Berlin either, which is why they fled to Amsterdam. Chaïm was six years old when the war broke out in the Netherlands. The antisemitic measures also applied to the young boy, and from 1942 onward he had to wear the yellow Star of David. Once again the family fled: with three small children, they moved from place to place through Belgium and France—always afraid of being arrested. After four months, they reached neutral Switzerland and survived the period of National Socialism there. In 1946, the Alster family returned to Amsterdam; Chaïm was now ten years old. But there was no reason for joy: all other relatives—grandparents, uncles and aunts, cousins—had been murdered in concentration camps. As a teenager, Chaïm felt lonely and unhappy, as many Dutch people reacted with hostility toward returning Jews. He later built a successful career as a businessman. As a contemporary witness, Chaïm Alster speaks regularly to school classes, focusing especially on the consequences that exclusion and discrimination have for people.